Your comments

I see. Thanks for the explanation. I didn’t hit the pin button because that seemed like a much more permanent action to me. Good to know. 

Another way to do it would be to just have an edit button for the currently opened file, which I think would be a good addition regardless. That would solve the problem and would likely be simpler to design with limited screen real estate.

Ok. If you could add that, it would be great. I find it somewhat important when you are working at the top line of a file. Then you can't see the end of the line unless you insert a newline.